No man, like I said, they all have new moves, and they're not just combinations of old stuff; all their new moves are canon and from the latest arcs. I mean, they didn't redo the entire movesets, but they added new moves, and I think all of them have new special attacks too, in one way or another.
No, I'm positive none of them have new special attacks. I actually seen all the special attacks. PTS Zoro always had Lion strike on his R button action. I think PTS Nami got a new one.
I've looked up some of Luffy's gameplay, and I notice some new attacks, but I think almost all of them could be done in PW2 either though stylish action gauge or leveling up high enough.
https://www.youtube.com/watch?v=xlAM4VR1zf8